Hi,
I am not much experienced in both HFM and Planning. But a question just came to my mind....
Since HFM uses dimensions... why doesn't it use Essbase? why use RDBMS? or this is how it is ? ask oracle
The only thing i can think of is that volume.
HFM need to store and perform calculation on larger data set as compared to essbase. Maybe i am wrong... just thinking loud
Regards